TM 10-6665-297-13&P2-6DETECTORINSTALLATION (continued)2-6.1InstallingConduits (continued)Explosion-proof, weatherproof, diffusion-samplingDetector #800-086½ -14 NPT female threadExplosion-proof, weatherproof, diffusion sampling, corrosion-proofDetector #0023-7317½ -14 NPT female threadThe #0023-4014 detector assembly is designed to mount directly in the duct to expose the detector element tothe gases being sampled. Mount #0023-4014 detector in the following manner.1.Locate a 1-¼" diameter hole in the duct wall so that detector body can be inserted through the plate assembly and project into the duct.2.Secure the plate assembly to the duct wall using four sheet metal screws through holes provided.3.Insert detector body into the plate assembly and secure by tightening the two knurled thumb screws.4.¾ " flexible conduit may be used to allow a convenient means of removing the detector assembly for servicing.NOTE: For potentially explosive areas, install wiring in accordance with National Electrical CodeArticles 501-517, which specify explosion-proof fitting, conduit sealing, and special wiring techniques.2-6.2 INSTALLINGDETECTORWIRING .Use good-quality wire or cable containing three conductors in onejacket. Install with a minimum number of splices. Cable laid in open trays near AC high-power lines, orcircuits to equipment which may generate radio-frequency (RF) signals, commutation noise, or ignition noise, should be sheathed or shielded. The outer braid of shielded cable must not contact conduit or junction boxes, and must be grounded only at the control module end. The cable should contain green,black, and white wires.Maximum resistance allowable in black and green (A and R conduit wires is 2.5 ohms per wire (5 ohmstotal A and R loop resistance, with A and R wire resistances the same within 0.1 ohm). A 1. 25-ohmmaximum resistance is allowable where two detectors share a common power lead from terminals Aand R to a remote point where power leads split.Wire gauge may be determined with respect to length of wire run as follows:23-96177/1/762-22
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